I witnessed an interesting episode a few years ago. The barn where I used to board was owned by an elderly gentleman, and he had an elderly horse named Peaches, she had been with him for years. The man spent the last few days of his life in a hospital type bed at home in his living room. He hadnt been out to the barn in months. A few days before he died, the family was with him around the bed, the man could no longer speak. But his eyes widened and he pointed outside through the picture window. There was Peaches, just standing there in the driveway.-
Now Peaches was always let out in the yard, but never would walk on stones due to founder/laminitis. But she was there on the crushed stone. She kept vigil for three days. At night, she would make her way to the barn for dinner, but when they let her out after breakfast, she would forsake the grass and stand by the window again.-
After the man died, Peaches never went back to the window, but spent her days in the field eating grass. She died about 3 years later of extreme old age.
I feel that when you have a bond with a horse that they would know when you are sick, but I do not think that a horse can pass away from a broken heart or anything like that, but who knows! All in all its a very sad story, but they are together still which is a comforting thought for all.